Handling Precautions - Motorola ASTRO XTSTM 2500 Basic Service Manual

Basic Maintenance
Handling
Precautions
4
Complementary metal-oxide semiconductor (CMOS) devices, and other high-
technology devices, are used in this family of radios. While these devices have
many attributes, their characteristics make them susceptible to damage by
electrostatic discharge (ESD) or high-voltage charges. Damage can be latent,
resulting in failures occurring weeks or months later. Therefore, special
precautions must be taken to prevent device damage during disassembly,
troubleshooting, and repair. Handling precautions are mandatory for this radio, and
are especially important in low-humidity conditions.
Never heat the RF PA above 210°C while performing repair or rework procedures
to maintain its integrity. Utilizing a Chipmaster (R1319 or R1321) top-side set point
of 215°C and a Dragon (R1427) bottom-side pre-heat set point of 180°C has
proven to satisfy this condition during the rework of the RF PA (note: the RF PA
temperature does not reach the Chipmaster's internal set point temperature). All
other parts on the transceiver board can be reworked with Chipmaster top-side
heat alone.